When I was looking through downloads here certain clothing (unlocked clothing options) they would enable the delete button and the OP would say to not delete anything in CAS or else the game will be corrupted.

IN that instance, they mean don't delete that download in CAS/Bodyshop. If you have something that unlocks, or recategorises clothing shipped with the game that enables the CC star and the trash bin icon, deleting it via the trash bin icon will mess up your game files and need a reinstall because it will be deleting core files. Unlockers and such like do not include the meshes and textures themselves, they use the ones from the core game files and just tell CAS/Bodyshop to show that clothing instead of hiding it. It's fine to delete completely custom clothing/hair/etc in CAS, including sims in the sim bin, or their faces from part 2. Deleting sims does cause the thumbnails to get messed up, and of course the whole orphan mesh thing is another issue, but neither of those will corrupt your game into needing a reinstall.

Deleting eyes/skins/genetics that sims are using will cause corrupt genetics, but that will happen however you delete them.

IN that instance, they mean don't delete that download in CAS/Bodyshop. If you have something that unlocks, or recategorises clothing shipped with the game that enables the CC star and the trash bin icon, deleting it via the trash bin icon will mess up your game files and need a reinstall because it will be deleting core files. Unlockers and such like do not include the meshes and textures themselves, they use the ones from the core game files and just tell CAS/Bodyshop to show that clothing instead of hiding it. It's fine to delete completely custom clothing/hair/etc in CAS, including sims in the sim bin, or their faces from part 2. Deleting sims does cause the thumbnails to get messed up, and of course the whole orphan mesh thing is another issue, but neither of those will corrupt your game into needing a reinstall.

Deleting eyes/skins/genetics that sims are using will cause corrupt genetics, but that will happen however you delete them.

Ohhh okay. Thank you for explaining it better, I get it now . And I don't think I'll be deleting genetic-type downloads any time soon, but this is good to know.